Usb fail on str km7

SOURCE: Video but no audio

This receiver does not support audio via HDMI. You need to connect BD player via spdif cable. Use optical or coax depending on what does the BD player support - receiver supports both.

SOURCE: i have a Sony STR-DE945

It's probably your fan.

The system runs hot, as it supplies a lot of power to push your speakers.

The system knows that without a fan, it will overheat. If the fan gets hot, the system will throw its self into safety mode, to keep it from burning its self up.

Have a tech check your fan.

SOURCE: My Sony km7 keep saying USB fail

YOU NEED TO FOREMAT YOUR USB CARD